写一个SQL: student(Sno, Sname, classId, grade )查出每个班成绩前三名的同学

时间:2021-01-11 11:07:05   收藏:0   阅读:0
SELECT * FROM student stu WHERE (
    SELECT COUNT(*) FROM student 
    WHERE stu.classid=classid AND stu.grade >= grade 
    GROUP BY classid HAVING COUNT(*)<=3
)
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迷上了代码!